<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        var a = {type:"Fiat", model:500, color:"white"}
        var b = [2, '', true]
        if ([]) {
            alert(true)
        } else {
            alert(false)
        }
        var a = {type:"Fiat", model:500, color:"white"}
        var b = [2, '', true]
        alert(Object.keys(a).length)
    </script>
</head>
<body>

</body>
</html>